View : 885 Download: 225
Amplified circularly polarized phosphorescence from co-assemblies of platinum(II) complexes
- Title
- Amplified circularly polarized phosphorescence from co-assemblies of platinum(II) complexes
- Authors
- Park, Gyurim; Kim, Hyungchae; Yang, Hoichang; Park, Kyung Ryoul; Song, Inho; Oh, Joon Hak; Kim, Changsoon; You, Youngmin
- Ewha Authors
- 유영민
- SCOPUS Author ID
- 유영민
- Issue Date
- 2019
- Journal Title
- CHEMICAL SCIENCE
- ISSN
- 2041-6520
2041-6539
- Citation
- CHEMICAL SCIENCE vol. 10, no. 5, pp. 1294 - 1301
- Publisher
- ROYAL SOC CHEMISTRY
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- Molecules capable of producing zero-field circularly polarized phosphorescence (CPP) are highly valuable for chiroptoelectronic applications that rely on triplet exciton. However, the paucity of tractable molecular design rules for obtaining CPP emission has inhibited full utilization. We report amplification of CPP by the formation of helical co-assemblies consisting of achiral square planar cycloplatinated complexes and small fractions of homochiral cycloplatinated complexes. The latter has a unique Pfeiffer effect during the formation of superhelical co-assemblies, enabling versatile chiroptical control. Large dissymmetry factors in electronic absorption (g(abs), 0.020) and phosphorescence emission (g(lum), 0.064) are observed from the co-assemblies. These values are two orders of magnitude improved relative to those of individual molecules. In addition, photoluminescence quantum yields (PLQY) also increase by a factor of ten. Our structural, photophysical, and quantum chemical investigations reveal that the chiroptical amplification is attributable to utilization of both the magnetically allowed electronic transition and asymmetric coupling of excitons. The strategy overcomes the trade-off between glum and PLQY which has frequently been found for previous molecular emitters of circularly polarized luminescence. It is anticipated that our study will provide new insight into the future research for the exploitation of the full potential of CPP.
- DOI
- 10.1039/c8sc04509g
- Appears in Collections:
- 공과대학 > 화공신소재공학과 > Journal papers
- Files in This Item:
-
Amplified circularly polarized phosphorescence.pdf(5.23 MB)
Download
- Export
- RIS (EndNote)
- XLS (Excel)
- XML